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How to trouble shoot a brake line leak
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Knee Draggin!
 
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How to trouble shoot a brake line leak - April 11, 2007, 12:49 PM

I had to replace the front master cylinder on my bike. After putting it on Im having trouble getting fluid all the way to the callipers.I tried to check for pressure by starting at the top removing the banjo bolt to the M.C, finger plugged squeezed the lever a few times released finger and got pressure and fluid. I moved down to the 1 to 2 splitter removed Banjo bolt and checked for suction again and had the same result. Now the kicker Ill do the banjo bolt for each calliper (1 at a time obviously)and Im getting nothing so I used a calliper banjo bolt (shorter than the splitter Banjo) and put it in the splitter but tested one line at a time leaving the other disconnected from the splitter all together. Using this method I got suction and was able to get fluid to each line but never got a steady stream. I AM using all the copper washers and even tried replacing them with new ones to get a nice seal. Is the culprate the splitter or a hairline crack in a hose or??? Any suggestions?
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April 11, 2007, 12:51 PM

Oh yeah when everything is hooked up besides the resevoir cap and I pump the lever Im not getting bubbles coming back to the resevoir like I should when its filling
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Thumbs down April 11, 2007, 07:26 PM

Thanks for all the input
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April 11, 2007, 08:14 PM

Are you sure you are not having a leaky mc? It is kinda hard to T/S this online. How old are the lines? Are these on the fzr? its a 94 so those lines are 13 years old and will have dryrot. If these are the orignals replace them with after markets.


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April 11, 2007, 08:51 PM

Thanks its actually on another bike Im fixing up a 96 CBR f3 Im having a tough time figuring this one out
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April 12, 2007, 05:33 AM

I would check the M/C and then just crack open the bleed screws and let it gravity bleed for a while. If that doesn't work, pull the calipers off the brackets and hang them above the M/C (closed up of course and try to build pressure that way.
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